Error when adding a file to a fileset

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I just upgraded concrete5 from 5.7.3.1 to 5.7.4.2 on my dev machine (localhost).

The upgrade was successfull.

Only when I add a file to a file set, I get an error showing me no further information... take a look at the attachment!

The error occurs when I upload a new file and try to add it to a set. And it accures when I try to add an existing file to a file set. Or when I try to remove a file from a file set.

I configured concrete5 to show me debug errors. But there is no further information about this error.

Any idea?

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core77 replied on at Permalink Reply
SOLVED:

In my development process i use xip.io and gulp.

So when i use the concrete5 file manager with the url given through xip.io, gulp and browsersync (http://127.0.0.1.xip.io:3000/) the above error occures.

Doing the same through the usualhttp://localhost/myconcrete5site... works!